Radeon HD 6750M - Sudden drop windows 7 user experience index scores and performance in Battlefield 3

Ok I have a strange problem regarding the performance of my graphics card Radeon HD 6750m in my bootcamped window 7 and maybe in OSX,here's what happened.
Firstly I noticed this when going to load up Battlefield 3 which has been ruining fine on low settings since it first came out, but today i loaded the game as usual and when i started playing i noticed that the performance had completely bogged down to about 1 fps and had became unplayable so had a look at the video settings and they were all the same (set to the lowest possible) so i quit the game and restarted the game/machine a couple of time but no change, still completely unplayable for no apparent reason.
So next a checked my Windows user experiance index number and notice that windows had detected changes in my hardware so i ran the test again, previously my scores were
cpu: 7.5
ram: 7.6
graphics: 6.9
gamming graphics: 6.9
Hdd:5.9
overall score 5.9
the new test results came in and every things else had stayed the same apart from the two relating to the graphics had some how changed, the new results were:
cpu:7.5
ram:7.6
graphics: 3.9
gaming graphics: 5.7
overall score
I was completely confused how such a drop in performance could happen as i have not changed any of the hardware? is almost like the performance has halved relating to my gpu.
I have tried reinstalling drivers but still no resolution
I was wondering if anyone else had had this problem and what the possible causes could be and how a could fix this
my hardware is:
MacBook Pro 17-inch, Early 2011
Processor 2.3 GHz Intel Core i7
Memory 8 GB 1333 MHz DDR3
Graphics AMD Radeon HD 6750M 1024 MB
hdd: 750 GB

Yeah its all very strange, in my opinion it must be something to with the drivers. After I had relised that something had seriously changed with my hardware setup in the way windows recognizes the graphics card, I tried reinstalling different versions of the drivers for the AMD Radeon HD 750M and one version gave me a small improvement of about 0.2 in the windows user experience thing scale in the category that scores the graphics (cant remember which version the driver was was as it was a spur of the moment thing) so could be a driver problem but it was working fine using the preview drivers AMD provided on their web site before.
I have also tried using the the original disk that bootcamp created during the install to re-install origianl divers (basically all the necessary drivers for windows to recognise hardware in Macbook Pro) and that never made any difference.
This also happened before the windows update that you wrote about Cuziuzi (its was an optional update for the windows 64bit) because I installed this after battlefield 3 had died on me thinking it might resolve the problem.
on a sidenote steam is refusing to lauch games on osx and i'am the process of re-downloading the game again to try and fixes the issue (have only got L4D2).
I am going to look into it tomorrow and try to figure out what the problem is and post some info about drivers specifications and some more clarifying information.
Hopefully my GPU is not in the process of dying on me after the constant heat bombardment it has to endure thanks to Apples great design philosophy of visual aesthetics over functionality, fingers crossed Battlefield has not fried it!
Also cziuzi what's ur hardware specs?

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Yeah its all very strange, in my opinion it must be something to with the drivers. After I had relised that something had seriously changed with my hardware setup in the way windows recognizes the graphics card, I tried reinstalling different versions of the drivers for the AMD Radeon HD 750M and one version gave me a small improvement of about 0.2 in the windows user experience thing scale in the category that scores the graphics (cant remember which version the driver was was as it was a spur of the moment thing) so could be a driver problem but it was working fine using the preview drivers AMD provided on their web site before.
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This also happened before the windows update that you wrote about Cuziuzi (its was an optional update for the windows 64bit) because I installed this after battlefield 3 had died on me thinking it might resolve the problem.
on a sidenote steam is refusing to lauch games on osx and i'am the process of re-downloading the game again to try and fixes the issue (have only got L4D2).
I am going to look into it tomorrow and try to figure out what the problem is and post some info about drivers specifications and some more clarifying information.
Hopefully my GPU is not in the process of dying on me after the constant heat bombardment it has to endure thanks to Apples great design philosophy of visual aesthetics over functionality, fingers crossed Battlefield has not fried it!
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Sharing iTunes library across 2 Windows user IDs

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Radeon HD 6750M - Sudden drop windows 7 user experience index scores and performance in Battlefield 3

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